• clayasaurus (38/38) Sep 24 2004 Hello, I'm trying to convert my structure ...
• h3r3tic (38/39) Sep 24 2004 You might try this (compiles):
• clayasaurus (6/57) Sep 24 2004 cool thanks. it's working so far :)

clayasaurus <clayasaurus gmail.com> writes:

Hello, I'm trying to convert my structure ...

struct Vector
{
    x,y,z;

    // Vector operator overloads
    Vector opAdd(Vector argVec)
    { // +
       Vector returnVec;
       returnVec.initialize(x + argVec.x, y + argVec.y, z + argVec.z);
       return returnVec;
    }
}

into a template...

struct Vector(T)
{
    T x,y,z;

    // Vector operator overloads
    Vector opAdd(Vector argVec)
    { // +
       Vector returnVec;
       returnVec.initialize(x + argVec.x, y + argVec.y, z + argVec.z);
       return returnVec;
    }
}

my problem is i've never used templates before and am confused on how 
they work :-/

for example, is my opAdd template code valid?

also, how do you pass templates into functions and modify them?

I've tried ....

template getCross(vector1, vector2) // how do I specify the Vector template?
{
    Vector normal;

    normal.x = 0; // here I get an error saying "no identifier for 
declarator"

    return normal; // here it says "declaration expected, not 'return'"
}

again I'm confused on how templates are supposed to work :-/

i would like some help please, thanks.

h3r3tic <h3r3tic dev.null> writes:

clayasaurus wrote:
 Hello, I'm trying to convert my structure ...

You might try this (compiles):

<code>
struct Vector(T)
{
     T x,y,z;

     static Vector opCall(T x, T y, T z)
     {
         Vector result;
         result.x = x;
         result.y = y;
         result.z = z;
         return result;
     }

     // Vector operator overloads
     Vector opAdd(Vector argVec)
     { // +
        return Vector(x + argVec.x, y + argVec.y, z + argVec.z);
     }
}

template getCross(T) // how do I specify the Vector template?
{
     Vector!(T) getCross(Vector!(T) vector1, Vector!(T) vector2)
     {
         Vector!(T) normal;

         normal.x = 0; // here I get an error saying "no identifier for 
declarator"

         return normal; // here it says "declaration expected, not 'return'"
     }
}

void main()
{
     Vector!(float) v1 = Vector!(float)(1, 2, 3);
     Vector!(float) v2 = Vector!(float)(2, 3, 4);

     Vector!(float) v3 = getCross!(float)(v1, v2);
}
</code>

Tom

clayasaurus <clayasaurus gmail.com> writes:

h3r3tic wrote:
 clayasaurus wrote:
 
 Hello, I'm trying to convert my structure ...

 
 
 You might try this (compiles):
 
 <code>
 struct Vector(T)
 {
     T x,y,z;
 
     static Vector opCall(T x, T y, T z)
     {
         Vector result;
         result.x = x;
         result.y = y;
         result.z = z;
         return result;
     }
 
     // Vector operator overloads
     Vector opAdd(Vector argVec)
     { // +
        return Vector(x + argVec.x, y + argVec.y, z + argVec.z);
     }
 }
 
 template getCross(T) // how do I specify the Vector template?
 {
     Vector!(T) getCross(Vector!(T) vector1, Vector!(T) vector2)
     {
         Vector!(T) normal;
 
         normal.x = 0; // here I get an error saying "no identifier for 
 declarator"
 
         return normal; // here it says "declaration expected, not 'return'"
     }
 }
 
 void main()
 {
     Vector!(float) v1 = Vector!(float)(1, 2, 3);
     Vector!(float) v2 = Vector!(float)(2, 3, 4);
 
     Vector!(float) v3 = getCross!(float)(v1, v2);
 }
 </code>
 
 Tom

cool thanks. it's working so far :)
this is the first time i've ever used templates (they confuse me a bit 
so i never really bothered with them, until I found a practical use for 
them)

Anyways, I'll post here again if/when my template struct is implemented :)